The iWay Functional Language offers many built-in functions. The set of functions is also extensible for users that have special needs. The details explaining how to write a user custom function are given in the iWay Programmer's Guide. If you wrote a user custom function for 5.x, it must be slightly modified to make it compatible with iSM 6.x. These changes were required to allow user functions to be placed into packages other than com.ibi.funcs.

The function must extend FunctionNode instead of funcNodeFunction.

These methods must be public:

• getMinParms()
• getMaxParms()
• getDesc()
• optimize()
• getXValue()